Q: how do i change my region or country?

System Preferences, Language & Text

This is before iTunes 11 but hopefully they haven't changed it too much.

App Store Frequently Asked Questions (FAQ) - http://support.apple.com/kb/HT2001 when using iTunes --> "To change countries, scroll to the end of the iTunes Store home page and click the flag indicating the current country. To choose a different country, click the appropriate flag."

iOS: Changing the signed-in iTunes Store account - http://support.apple.com/kb/HT1311  - Change your iTunes Store country: "Sign in to the account for the iTunes Store region you'd like to use. Tap Settings > iTunes & App Stores > Apple ID: > View Apple ID > Country/Region."

You will, of course, need to change your address and enter valid credit card information after you have changed the settings.

iTunes Store: Changing Account Information - http://support.apple.com/kb/HT1918

Further tips on changing country - https://discussions.apple.com/message/20029737 - problems you encounter when changing iTunes country

Go to setting then iTunes an apple App Store and hit your email address and hit view Apple ID then change your country and region